How to use org.eclipse.jdt.internal.ui.text.correction.proposals

  @Override
  public ExitFlags doExit(LinkedModeModel model, VerifyEvent event, int offset, int length) {
    fShowPreview= (event.stateMask & SWT.CTRL) != 0
            && (event.character == SWT.CR || event.character == SWT.LF);
    return super.doExit(model, event, offset, length);
  }
}

@Override
protected Change createChange() throws CoreException {
  CompilationUnitChange addRequiresChange= createAddRequiresChange();
  return addRequiresChange;
}

@Override
public boolean visit(MoveSourceEdit edit) {
  return rangeRemoved(edit);
}

public static RearrangeStrategy create(Statement origStmt, ASTRewrite rewrite, TextEditGroup group) {
  ASTNode parent = origStmt.getParent();
  if (parent instanceof Block) {
    Block block= (Block)parent;
    if (origStmt instanceof VariableDeclarationStatement)
      return new ModifyBlockWithLocalDecl(origStmt, block, rewrite, group);
    else
      return new ModifyBlock(origStmt, block, rewrite, group);
  } else {
    return new ReplaceStatement(origStmt, rewrite, group);
  }
}

@Override
public int getRelevance() {
  IStatus status= getFixStatus();
  if (status != null && !status.isOK()) {
    return super.getRelevance() - 100;
  } else {
    return super.getRelevance();
  }
}

private void configureWizardPage(NewTypeWizardPage page) {
  fillInWizardPageName(page);
  fillInWizardPageSuperTypes(page);
}

@Override
public boolean visit(InsertEdit edit) {
  return rangeAdded(edit);
}

public void unchangedUntil(int pos) {
  if (pos > fWrittenToPos) {
    appendContent(fPreviewDocument, fWrittenToPos, pos, true);
    fWrittenToPos= pos;
  }
}

@Override
public int compare(ASTNode o1, ASTNode o2) {
  return rank(o1) - rank(o2);
}

@Override
public int compare(ITypeBinding o1, ITypeBinding o2) {
  return rank(o2) - rank(o1);
}

private boolean isMoreSpecific(ITypeBinding best, ITypeBinding curr) {
  return (canAssign(best, curr) && !canAssign(curr, best));
}

public static RearrangeStrategy create(Statement origStmt, ASTRewrite rewrite, TextEditGroup group) {
  ASTNode parent = origStmt.getParent();
  if (parent instanceof Block) {
    Block block= (Block)parent;
    if (origStmt instanceof VariableDeclarationStatement)
      return new ModifyBlockWithLocalDecl(origStmt, block, rewrite, group);
    else
      return new ModifyBlock(origStmt, block, rewrite, group);
  } else {
    return new ReplaceStatement(origStmt, rewrite, group);
  }
}

@Override
public int getRelevance() {
  IStatus status= getFixStatus();
  if (status != null && !status.isOK()) {
    return super.getRelevance() - 100;
  } else {
    return super.getRelevance();
  }
}

@Override
public boolean visit(MoveSourceEdit edit) {
  return rangeRemoved(edit);
}

  @Override
  public ExitFlags doExit(LinkedModeModel model, VerifyEvent event, int offset, int length) {
    fShowPreview= (event.stateMask & SWT.CTRL) != 0
            && (event.character == SWT.CR || event.character == SWT.LF);
    return super.doExit(model, event, offset, length);
  }
}

@Override
public boolean visit(InsertEdit edit) {
  return rangeAdded(edit);
}

public void unchangedUntil(int pos) {
  if (pos > fWrittenToPos) {
    appendContent(fPreviewDocument, fWrittenToPos, pos, true);
    fWrittenToPos= pos;
  }
}

@Override
public int compare(ASTNode o1, ASTNode o2) {
  return rank(o1) - rank(o2);
}

@Override
public boolean visit(DeleteEdit edit) {
  return rangeRemoved(edit);
}

@Override
public boolean visit(DeleteEdit edit) {
  return rangeRemoved(edit);
}